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Cracking in Asphalt Pavements: Impact of Component Properties and Aging on Fatigue and Thermal Cracking

机译：沥青路面开裂：部件性能和老化对疲劳和热裂纹的影响

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摘要

Cracking in asphalt pavements is one of the most common and critical pavement distresses. Cracks let the water penetrate from the surface to underlying layers resulting in shorter pavement service life and poor riding quality. There are various factors that affect the cracking potential of asphalt mixtures including the properties of asphalt components, mix design factors, loading time and loading mode, temperature, stress state, and aging. While several researchers have conducted studies investigating the cracking of asphalt mixtures, the effective parameters are not all well understood to allow engineers to design and construct more resistant pavements against cracking.;The work presented in this dissertation provides some additional insights into the effects of component properties and aging condition on asphalt cracking. The cracking susceptibility of hot mix asphalt (HMA) is evaluated through the experimental testing and numerical modeling on mixtures produced either in design (laboratory) or production (plant) stage. Various criteria and approaches for the prediction of cracking in asphalt binder and asphalt mixture are assessed and their correlation are discussed. Different levels of aging in laboratory are simulated, and the effects of long term oven aging (LTOA) on linear viscoelastic parameters, fatigue and fracture characteristics of asphalt mixtures are explored. The uniaxial tensile fatigue testing based on simplified viscoelastic continuum damage (SVECD) approach is conducted to characterize fatigue behavior, and semi circular bending (SCB), disc-shaped compact tension (DCT) testing and cohesive zone model are used to evaluate thermal cracking in asphalt mixtures.;This dissertation makes a good contribution in improvement of available approaches for evaluation of cracking potential of asphalt pavements and allows for assessment of different mixtures at early stage of material selection. The results of this study can lead to develop a new parameter to predict fatigue and thermal cracking susceptibility of flexible pavements in performance-based specifications, resulting in a better ride quality and cost saving for contractors and taxpayers.
机译：沥青路面开裂是最常见和最严重的路面问题之一。裂缝使水从表面渗透到下层，从而缩短了路面使用寿命并降低了骑行质量。影响沥青混合料开裂潜力的因素有很多，包括沥青组分的性能，混合料设计因素，加载时间和加载方式，温度，应力状态和老化。尽管有几位研究人员进行了沥青混合料的开裂研究，但对有效参数的理解并没有全部被理解，从而使工程师可以设计和建造更能抵抗开裂的人行道。沥青开裂的性质和老化条件。通过对在设计（实验室）或生产（工厂）阶段生产的混合物进行实验测试和数值建模，可以评估热拌沥青（HMA）的开裂敏感性。评估了各种预测沥青结合料和沥青混合料开裂的标准和方法，并讨论了它们的相关性。模拟了实验室中不同程度的老化，并探讨了长期烤箱老化（LTOA）对沥青混合料的线性粘弹性参数，疲劳和断裂特性的影响。进行了基于简化粘弹性连续体损伤（SVECD）方法的单轴拉伸疲劳测试以表征疲劳行为，并使用半圆弯曲（SCB），盘形紧凑拉伸（DCT）测试和内聚区模型来评估热裂纹。本论文为改进现有的评价沥青路面开裂潜力的方法做出了很大的贡献，并允许在材料选择的早期评估不同的混合物。这项研究的结果可以导致开发一个新的参数，以预测基于性能的规范中的柔性路面的疲劳和热裂敏感性，从而为承包商和纳税人带来更好的乘坐质量并节省成本。

著录项

  • 作者

    Rahbar-Rastegar, Reyhaneh.;

  • 作者单位

    University of New Hampshire.;

  • 授予单位 University of New Hampshire.;
  • 学科 Civil engineering.
  • 学位 Ph.D.
  • 年度 2017
  • 页码 179 p.
  • 总页数 179
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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